Low voltage lamps will not accept mains voltages so they have to be powered via a transformer - if your bulbs are low voltage there will be a transformer - two lamps at 300W total on a low voltage 12V circuit will need 25A and very big wires - you very probably have mains voltage lamps and no transformer...
Given what you report the Dimmer Switch must be suspect.
Peccavi
March 2009
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